New World Blackbirds (Icteridae)

Streak-backed Oriole (Icterus pustulatus) - HBW 16, p. 763

French: Oriole à dos rayé German: Piroltrupial Spanish: Turpial Dorsilistado
Other common names: Scarlet-headed Oriole (“pustulatus group”); Tres Marias Oriole (graysonii); Sclater’s Oriole (“sclateri group”)

Taxonomy: Ps.[arocolius] pustulatus Wagler, 1829, Mexico.
DNA data indicate that present species is sister to I. bullockii. Races often divided into three groups, “pustulatus group” (nominate race and microstictus) in N of range, single-species “graysonii group” on Tres Marias Is (off WC Mexico) and “sclateri group” (formosus, maximus, alticola, sclateri and pustuloides) in S of range. Groups sometimes thought to represent three distinct species, but mitochondrial-DNA divergence among mainland races slight; on other hand, insular graysonii, isolated for longer ti.. View all taxonomy...

Taxonomy: Ps.[arocolius] pustulatus Wagler, 1829, Mexico.
DNA data indicate that present species is sister to I. bullockii. Races often divided into three groups, “pustulatus group” (nominate race and microstictus) in N of range, single-species “graysonii group” on Tres Marias Is (off WC Mexico) and “sclateri group” (formosus, maximus, alticola, sclateri and pustuloides) in S of range. Groups sometimes thought to represent three distinct species, but mitochondrial-DNA divergence among mainland races slight; on other hand, insular graysonii, isolated for longer time, may warrant treatment as a full species, but scant information available on its behaviour and breeding biology. In Mexico, birds from S Sinaloa S to S Nayarit sometimes placed in separate race yaegeri, those from SW Jalisco S to S Guerrero in dickermani, and birds in interior C & S Mexico in interior, but diagnostic characters of these uncertain. Other proposed races are flammulatus (described from Monte Redondo, in Honduras), subsumed in alticola, and connectens (interior El Salvador), which is intermediate between alticola and sclateri and is merged with latter. Eight subspecies currently recognized.

Subspecies and Distribution:

  • microstictus Griscom, 1934 - W Mexico from Sonora and W Chihuahua S to Jalisco.
  • graysonii Cassin, 1867 - Tres Marías Is, off W coast of Mexico (Nayarit).
  • pustulatus (Wagler, 1829) - S Mexico from Colima S to Puebla, W Veracruz and N Oaxaca.

     See all 8 subspecies
  • microstictus Griscom, 1934 - W Mexico from Sonora and W Chihuahua S to Jalisco.
  • graysonii Cassin, 1867 - Tres Marías Is, off W coast of Mexico (Nayarit).
  • pustulatus (Wagler, 1829) - S Mexico from Colima S to Puebla, W Veracruz and N Oaxaca.
  • formosus Lawrence, 1872 - S Mexico (S Oaxaca and Chiapas) S to NW Guatemala.
  • maximus Griscom, 1930 - R Negro valley, in NC Guatemala.
  • alticola W. deW. Miller & Griscom, 1925 - Guatemala and W Honduras.
  • sclateri Cassin, 1867 - Pacific coast from El Salvador S to NW Costa Rica.
  • pustuloides van Rossem, 1927 - Volcán San Miguel, in EC El Salvador.
  •      No sound recordings available yet